The pH balance of the vagina is important for maintaining overall vaginal health. The normal pH level of the vagina is between 3.8 and 4.5, which is moderately acidic. This acidic environment is created by healthy, acid-producing bacteria that live in the vagina, called Lactobacilli, which produce lactic acid and hydrogen peroxide. The acidic environment helps prevent unhealthy bacteria and yeast from multiplying too quickly, which can cause infections.

Factors that can change the pH balance of the vagina include existing health conditions, lifestyle, menstrual cycle, douching, and the presence of menstrual blood. Antibiotics can also wipe out all bacteria, including the healthy bacteria that help maintain a healthy, acidic vaginal pH level.

Symptoms of an unbalanced vaginal pH level can include a strong, fish-like smell coming from the vagina, grey, green, or foamy vaginal discharge, itching, pain during or after penetrative sex, and pain or burning during urination.

To maintain a healthy vaginal pH balance, it is important to avoid douching, wear breathable cotton underwear, and avoid using scented products in the genital area. Eating fermented foods with live probiotics and taking probiotic supplements with Lactobacilli may also be beneficial. If you are concerned about a change in vaginal odor or other symptoms, it is important to talk to your healthcare provider.